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Crop simulations

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https://www.readbyqxmd.com/read/28102202/consistent-negative-response-of-us-crops-to-high-temperatures-in-observations-and-crop-models
#1
Bernhard Schauberger, Sotirios Archontoulis, Almut Arneth, Juraj Balkovic, Philippe Ciais, Delphine Deryng, Joshua Elliott, Christian Folberth, Nikolay Khabarov, Christoph Müller, Thomas A M Pugh, Susanne Rolinski, Sibyll Schaphoff, Erwin Schmid, Xuhui Wang, Wolfram Schlenker, Katja Frieler
High temperatures are detrimental to crop yields and could lead to global warming-driven reductions in agricultural productivity. To assess future threats, the majority of studies used process-based crop models, but their ability to represent effects of high temperature has been questioned. Here we show that an ensemble of nine crop models reproduces the observed average temperature responses of US maize, soybean and wheat yields. Each day >30 °C diminishes maize and soybean yields by up to 6% under rainfed conditions...
January 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28091574/an-inert-pesticide-adjuvant-synergizes-viral-pathogenicity-and-mortality-in-honey-bee-larvae
#2
Julia D Fine, Diana L Cox-Foster, Christopher A Mullin
Honey bees are highly valued for their pollination services in agricultural settings, and recent declines in managed populations have caused concern. Colony losses following a major pollination event in the United States, almond pollination, have been characterized by brood mortality with specific symptoms, followed by eventual colony loss weeks later. In this study, we demonstrate that these symptoms can be produced by chronically exposing brood to both an organosilicone surfactant adjuvant (OSS) commonly used on many agricultural crops including wine grapes, tree nuts and tree fruits and exogenous viral pathogens by simulating a horizontal transmission event...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28079366/the-neonicotinoid-insecticide-thiacloprid-impacts-upon-bumblebee-colony-development-under-field-conditions
#3
Ciaran Ellis, Kirsty J Park, Penelope Whitehorn, Arthur David, Dave Goulson
The impacts of pesticides, and in particular of neonicotinoids, on bee health remain much debated. Many studies describing negative effects have been criticised as the experimental protocol did not perfectly simulate real-life field scenarios. Here, we placed free-flying bumblebee colonies next to raspberry crops that were either untreated or treated with the neonicotinoid thiacloprid as part of normal farming practice. Colonies were exposed to the raspberry crops for a two week period before being relocated to either a flower-rich or flower-poor site...
January 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28069301/future-water-availability-in-the-largest-freshwater-mediterranean-lake-is-at-great-risk-as-evidenced-from-simulations-with-the-swat-model
#4
Tuba Bucak, Dennis Trolle, Hans Estrup Andersen, Hans Thodsen, Şeyda Erdoğan, Eti E Levi, Nur Filiz, Erik Jeppesen, Meryem Beklioğlu
Inter- and intra-annual water level fluctuations and changes in water flow regime are intrinsic characteristics of Mediterranean lakes. Additionally, considering climate change projections for the water-limited Mediterranean region, increased air temperatures and decreased precipitation are anticipated, leading to dramatic declines in lake water levels as well as severe water scarcity problems. The study site, Lake Beyşehir, the largest freshwater lake in the Mediterranean basin, is - like other Mediterranean lakes - threatened by climatic changes and over-abstraction of water for irrigated crop farming...
January 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28067005/phosphorus-in-agricultural-soils-drivers-of-its-distribution-at-the-global-scale
#5
Bruno Ringeval, Laurent Augusto, Hervé Monod, Dirk van Apeldoorn, Lex Bouwman, Xiaojuan Yang, David L Achat, Louise P Chini, Kristof Van Oost, Bertrand Guenet, Rong Wang, Bertrand Decharme, Thomas Nesme, Sylvain Pellerin
Phosphorus (P) availability in soils limits crop yields in many regions of the world, while excess of soil P triggers aquatic eutrophication in other regions. Numerous processes drive the global spatial distribution of P in agricultural soils, but their relative roles remain unclear. Here, we combined several global datasets describing these drivers with a soil P dynamics model to simulate the distribution of P in agricultural soils and to assess the contributions of the different drivers at the global scale...
January 9, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28063186/the-combined-and-separate-impacts-of-climate-extremes-on-the-current-and-future-us-rainfed-maize-and-soybean-production-under-elevated-co2
#6
Zhenong Jin, Qianlai Zhuang, Jiali Wang, Sotirios V Archontoulis, Zachary Zobel, Veerabhadra R Kotamarthi
Heat and drought are two emerging climatic threats to the US maize and soybean production, yet their impacts on yields are collectively determined by the magnitude of climate change and rising atmospheric CO2 concentrations. This study quantifies the combined and separate impacts of high temperature, heat and drought stresses on the current and future US rainfed maize and soybean production, and for the first time characterizes spatial shifts in the relative importance of individual stress. Crop yields are simulated using the Agricultural Production Systems sIMulator (APSIM), driven by high-resolution (12 km) dynamically downscaled climate projections for 1995-2004 and 2085-2094...
January 7, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28056056/par-interception-and-utilization-in-different-maize-and-soybean-intercropping-patterns
#7
Xin Liu, Tanzeelur Rahman, Feng Yang, Chun Song, Taiwen Yong, Jiang Liu, Cuiying Zhang, Wenyu Yang
The crop intercepted photosynthetically active radiation (PAR) and radiation use efficiency (RUE) vary markedly in different intercropping systems. The HHLA (horizontally homogeneous leaf area) and ERCRT (extended row crop radiation transmission) models have been established to calculate the intercepted PAR for intercrops. However, there is still a lack of study on the intercepted PAR and RUE under different intercropping configurations using different models. To evaluate the intercepted PAR and RUE in maize and soybean under different intercropping systems, we tested different strip intercropping configurations (SI1, SI2, and SI3 based on ERCRT model) and a row intercropping configurations (RI based on HHLA model) in comparison to monoculture...
2017: PloS One
https://www.readbyqxmd.com/read/28054268/optimizing-the-phosphorus-use-in-cotton-by-using-csm-cropgro-cotton-model-for-semi-arid-climate-of-vehari-punjab-pakistan
#8
Asad Amin, Wajid Nasim, Muhammad Mubeen, Muhammad Nadeem, Liaqat Ali, Hafiz Mohkum Hammad, Syeda Refat Sultana, Khawar Jabran, M Habib Ur Rehman, Shakeel Ahmad, Muhammad Awais, Atta Rasool, Shah Fahad, Shah Saud, Adnan Noor Shah, Zahid Ihsan, Shahzad Ali, Ali Ahsan Bajwa, Khalid Rehman Hakeem, Asif Ameen, Amanullah, Hafeez Ur Rehman, Fahad Alghabar, Ghulam Hussain Jatoi, Muhammad Akram, Aziz Khan, Faisal Islam, Syed Tahir Ata-Ul-Karim, Muhammad Ishaq Asif Rehmani, Sajid Hussain, Muhammad Razaq, Amin Fathi
Crop nutrient management is an essential component of any cropping system. With increasing concerns over environmental protection, improvement in fertilizer use efficiencies has become a prime goal in global agriculture system. Phosphorus (P) is one of the most important nutrients, and strategies are required to optimize its use in important arable crops like cotton (Gossypium hirsutum L.) that has great significance. Sustainable P use in crop production could significantly avoid environmental hazards resulting from over-P fertilization...
January 4, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28047657/su-f-j-140-using-handheld-stereo-depth-cameras-to-extend-medical-imaging-for-radiation-therapy-planning
#9
C Jenkins, L Xing, S Yu
PURPOSE: A correct body contour is essential for the accuracy of dose calculation in radiation therapy. While modern medical imaging technologies provide highly accurate representations of body contours, there are times when a patient's anatomy cannot be fully captured or there is a lack of easy access to CT/MRI scanning. Recently, handheld cameras have emerged that are capable of performing three dimensional (3D) scans of patient surface anatomy. By combining 3D camera and medical imaging data, the patient's surface contour can be fully captured...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28038335/airborne-soil-particulates-as-vehicles-for-salmonella-contamination-of-tomatoes
#10
Govindaraj Dev Kumar, Robert C Williams, Hamzeh M Al Qublan, Nammalwar Sriranganathan, Renee R Boyer, Joseph D Eifert
The presence of dust is ubiquitous in the produce growing environment and its deposition on edible crops could occur. The potential of wind-distributed soil particulate to serve as a vehicle for S. Newport transfer to tomato blossoms and consequently, to fruits, was explored. Blossoms were challenged with previously autoclaved soil containing S. Newport (9.39log CFU/g) by brushing and airborne transfer. One hundred percent of blossoms brushed with S. Newport-contaminated soil tested positive for presence of the pathogen one week after contact (P<0...
December 14, 2016: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28031811/balancing-competition-for-resources-with-multiple-pest-regulation-in-diversified-agroecosystems-a-process-based-approach-to-reconcile-diversification-and-productivity
#11
Charlotte Poeydebat, Dominique Carval, Luc de Lapeyre de Bellaire, Philippe Tixier
Agroecosystem plant diversification can enhance pest biological regulation and is a promising alternative to pesticide application. However, the costs of competition for resources between plants may exceed the benefits gained by pest regulation. To disentangle the interactions between pest regulation and competition, we developed a generic process-based approach that accounts for the effects of an associated plant and leaf and root pests on biomass production. We considered three crop-plant associations that differ in competition profiles, and we simulated biomass production under wide ranges of both pest regulation rates and resources' availability...
December 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/28018845/maximizing-the-potential-of-multi-parental-crop-populations
#12
REVIEW
Olufunmilayo Ladejobi, James Elderfield, Keith A Gardner, R Chris Gaynor, John Hickey, Julian M Hibberd, Ian J Mackay, Alison R Bentley
Most agriculturally significant crop traits are quantitatively inherited which limits the ease and efficiency of trait dissection. Multi-parent populations overcome the limitations of traditional trait mapping and offer new potential to accurately define the genetic basis of complex crop traits. The increasing popularity and use of nested association mapping (NAM) and multi-parent advanced generation intercross (MAGIC) populations raises questions about the optimal design and allocation of resources in their creation...
December 2016: Applied & Translational Genomics
https://www.readbyqxmd.com/read/27995505/cd-inhibition-and-ph-improvement-via-a-nano-submicron-mineral-based-soil-conditioner
#13
Shanke Liu, Huan Li, Cheng Han, Xuebin Sheng, Jianming Liu
Cd contamination of rice in recent years has aroused a nationwide concern on the potential health risk to people in China. A significant increase of soil acidification in major Chinese croplands improves available Cd content by crops, and this further pushes a heavier burden on controlling Cd contamination. Therefore, it is urgent to find a workable and green way to control Cd contamination, i.e., decrease Cd content in rice, for people's health in China, as other countries in the world. From chemical and economic points, stabilizing/solidifying Cd may be a feasible way except in-situ ways such as removing it by the absorption of special plants and ex-situ ones such as removing the contaminated soil and treating it by special equipment...
December 19, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27986318/sensitivity-analysis-of-the-stics-macro-model-to-identify-cropping-practices-reducing-pesticides-losses
#14
Sabine-Karen Lammoglia, David Makowski, Julien Moeys, Eric Justes, Enrique Barriuso, Laure Mamy
STICS-MACRO is a process-based model simulating the fate of pesticides in the soil-plant system as a function of agricultural practices and pedoclimatic conditions. The objective of this work was to evaluate the influence of crop management practices on water and pesticide flows in contrasted environmental conditions. We used the Morris screening sensitivity analysis method to identify the most influential cropping practices. Crop residues management and tillage practices were shown to have strong effects on water percolation and pesticide leaching...
December 13, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27943025/a-theoretical-approach-to-analyze-the-parametric-influence-on-spatial-patterns-of-spodoptera-frugiperda-j-e-smith-lepidoptera-noctuidae-populations
#15
A G Garcia, W A C Godoy
Studies of the influence of biological parameters on the spatial distribution of lepidopteran insects can provide useful information for managing agricultural pests, since the larvae of many species cause serious impacts on crops. Computational models to simulate the spatial dynamics of insect populations are increasingly used, because of their efficiency in representing insect movement. In this study, we used a cellular automata model to explore different patterns of population distribution of Spodoptera frugiperda (J...
December 10, 2016: Neotropical Entomology
https://www.readbyqxmd.com/read/27939083/long-term-diffuse-phosphorus-pollution-dynamics-under-the-combined-influence-of-land-use-and-soil-property-variations
#16
Haobo Huang, Wei Ouyang, Haotian Wu, Hongbin Liu, Critto Andrea
Analyses of the spatial-temporal distribution of diffuse pollution in agricultural regions are essential to the sustained management of water resources. Although nutrients, such as phosphorus fertilizers, can promote crop growth while improving soil fertility, excessive nutrient inputs can produce diffuse pollution, which may results in water quality degradation. The objective of this paper is to employ the SWAT (Soil and Water Assessment Tool) to estimate diffuse P effects on temporal and spatial distributions for a typical agricultural watershed and to identify the conjunct and independent influences of long-term land use and soil properties variation on diffuse P...
February 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27929054/in-silico-identification-of-snp-diversity-in-cultivated-and-wild-tomato-species-insight-from-molecular-simulations
#17
Archana Bhardwaj, Yogeshwar Vikram Dhar, Mehar Hasan Asif, Sumit K Bag
Single Nucleotide Polymorphisms (SNPs), an important source of genetic variations, are often used in crop improvement programme. The present study represented comprehensive In silico analysis of nucleotide polymorphisms in wild (Solanum habrochaites) and cultivated (Solanum lycopersicum) species of tomato to explore the consequence of substitutions both at sequence and structure level. A total of 8978 SNPs having Ts/Tv (Transition/Transversion) ratio 1.75 were identified from the Expressed Sequence Tag (EST) and Next Generation Sequence (NGS) data of both the species available in public databases...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27917017/determination-of-coefficient-defining-leaf-area-development-in-different-genotypes-plant-types-and-planting-densities-in-peanut-arachis-hypogeae-l
#18
Oumarou Halilou, Halime Mahamat Hissene, José A Clavijo Michelangeli, Falalou Hamidou, Thomas R Sinclair, Afshin Soltani, Saadou Mahamane, Vincent Vadez
Rapid leaf area development may be attractive under a number of cropping conditions to enhance the vigor of crop establishment and allow rapid canopy closure for maximizing light interception and shading of weed competitors. This study was undertaken to determine (1) if parameters describing leaf area development varied among ten peanut (Arachis hypogeae L.) genotypes grown in field and pot experiments, (2) if these parameters were affected by the planting density, and (3) if these parameters varied between Spanish and Virginia genotypes...
December 2016: Field Crops Research
https://www.readbyqxmd.com/read/27909573/how-to-put-plant-root-uptake-into-a-soil-water-flow-model-a-documentation-with-complete-computer-code
#19
Xuejun Dong
The need for improved crop water use efficiency calls for flexible modeling platforms to implement new ideas in plant root uptake and its regulation mechanisms. This paper documents the details of modifying a soil infiltration and redistribution model to include (a) dynamic root growth, (b) non-uniform root distribution and water uptake, (c) the effect of water stress on plant water uptake, and (d) soil evaporation. The paper also demonstrates strategies of using the modified model to simulate soil water dynamics and plant transpiration considering different sensitivity of plants to soil dryness and different mechanisms of root water uptake...
2016: F1000Research
https://www.readbyqxmd.com/read/27905512/plant-phenolic-volatiles-inhibit-quorum-sensing-in-pectobacteria-and-reduce-their-virulence-by-potential-binding-to-expi-and-expr-proteins
#20
Janak Raj Joshi, Netaly Khazanov, Hanoch Senderowitz, Saul Burdman, Alexander Lipsky, Iris Yedidia
Quorum sensing (QS) is a population density-dependent regulatory system in bacteria that couples gene expression to cell density through accumulation of diffusible signaling molecules. Pectobacteria are causal agents of soft rot disease in a range of economically important crops. They rely on QS to coordinate their main virulence factor, production of plant cell wall degrading enzymes (PCWDEs). Plants have evolved an array of antimicrobial compounds to anticipate and cope with pathogens, of which essential oils (EOs) are widely recognized...
December 1, 2016: Scientific Reports
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